Method and an arrangement for the detection of ionizing current

Details Method and an arrangement for the detection of ionizing current Method and an arrangement for the detection of ionizing current

1988-08-25

1989-08-29

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Using ionization effects

For analysis of gas, vapor, or particles of matter

324460, 324380, 123425, G01N 2762, F02P 1700

Patent

active

048620939

ABSTRACT:
The invention relates to a method and an arrangement for detecting ionizing current in an ignition circuit incorporated in the ignition system of an internal combustion engine, in which a measuring voltage is applied to the ignition circuit in at least one secondary winding, and in which a measuring device is used to detect the possible presence of an ionizing current in the ignition circuit. A low measuring voltage is applied during an engine start sequence, or alternatively, no measuring voltage at all, and a high measuring voltage is applied subsequent to the engine start. The invention thereby overcomes the problem existing when measuring ionizing currents of the spark plugs becoming coated with soot deposits as a result of the electrical voltage field which always exists between the electrodes of respective plugs. Such problem is particularly troublesome during an engine start sequence, since the deposits can prevent the engine from starting.

REFERENCES:
patent: 4291383 (1981-09-01), Tedeschi et al.
patent: 4359893 (1982-11-01), Kizler et al.
patent: 4491110 (1985-01-01), Bone et al.
patent: 4515132 (1985-05-01), Anderson et al.
patent: 4601193 (1986-07-01), Reinhold Blauhut
patent: 4648367 (1987-03-01), Gillbrand et al.

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